CIPM MRA COMPARISON REPORTS

A key comparison has been made between the absorbed dose to water standards of the National Physical Laboratory (NPL), United Kingdom, and the Bureau International des Poids et Mesures (BIPM) in accelerator photon beams. The results show the standards to be in agreement within the standard uncertainty of the comparison of 7.7 parts in 10³. The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database.